Steel form for placing concrete



1965 TOMOHARU SAKAI ETAL STEEL FORM FOR PLACING CONCRETE 3 Sheets-Sheet 1 Filed Dec. 26, 1963 INVENTORS mw i /ihfi am ATTORNEYS Jan. 26, 1965 TOMOHARU SAKAl ETAL 3,165,318

STEEL FORM FOR PLACING CONCRETE 5 Sheets-Sheet 2 Filed Dec. 26, 1965 INVENTORS' BY A/ Z, #Mfl FM ATTORNEYS Jan. 26, 1965 TQMQHARU SAKA] ETAL 3,166,818

STEEL FORM FOR PLACING CONCRETE 3 Sheets-Sheet 3 Filed Dec. 26, 1963 INVENTOR S m M ATTORNEYS 3 166,818 STEEL FORM FOR PLACING CONCRETE Tomoharu Sakai, Toyonaka, and Tetsuto Osato, Nishmomiya, Japan, assignors to Sumitomo Metal Industries Limited, Osaka, Japan, a corporation of .lapan Filed Dec. 26, 1963, Ser. No. 333,32il Claims priority, application Japan, Dec. 29, li /6 2,

37/59,9S5 9 Claims. (Cl. 25-131) This invention relates to steel forms for placing con crete in constructing such concrete structures as walls, tunnels and arches. The steel form of the present invention has advantages that it can finish precise and smooth concrete surfaces, that it is easy'to handle, that it can provide high speeds in working and disassembling and that it has its own shape and high strength intended to improve the rigidity against the concrete pressure and tor- SlOD.

Generally, the conditions as of a steel form for placing concrete are that it must be light and rigid and that it must be easy to handle. Metallic forms for placing concrete have recently come to be used in place of wooden forms. Various steel forms have been invented. However, in any of them, as the form and assembling clamps are made separately, in assembling the forms, they are alined with alining pins and are clamped with clamps. In such case, clamping pins are passed through bores made in the external frames of the two adjacent forms to be clamped together. In case said external frames are in over-all contact with each other, the bores made in them will integrally coincide with each other and therefore the pin passed through such bores will have freedom in the entering direction. That is to say, there are defects that, as the pin can change the entering direction, even in case the long frames of both forms are not correctly in contact with each other, the pins will be able to be passed and the forms will be likely to be assembled as not correctly alined, that, as the pins and clamps are separated from the forms, in the case of assembling the forms in a high place, they will have to be carried up separately from the forms and that such forms are not only very inconvenient to handle but also diflicult to assemble.

An object of the present invention is to provide a concrete placing steel form with which clamps are integral so that the loss and danger due to the drop of the clamps may be prevented and the'assembling may be very quick and simple.

Another object of the present invention is'to provide a concrete placing'steel form wherein the external frame isn'ot made fiat but is formed to be of a W-shape so that the form may have a high rigidity against the concrete pressure and torsion.

A'further object of the present invention is to provide 7 vide a concrete placing steel form which can be generally used for various structures, is very high in rigidity, is easy to handle, has few supporters and is very simple to carry and store together with accessories.

In the accompanying drawings,

FIGURE 1 is a partial plan view of an embodiment of aflat steel form according to the present invention;

FIGURE 2 is a perspective view of a clamp for a steel form of the present invention; p i

FIGURE 3 is a perspective view showing steel forms of thepresent invention as clamped;

FIGURE 4 is a perspective view of an embodiment of a steel form for a re-entering angle according to the present invention;

3,166,818 Patented Jan. 26, 1965 "ice FIGURE 5 is a perspectiveview showing a re-entering FIGURE 8 is a perspective View of an embodiment of i a steel form for an external angle according to the present invention;

FIGURE 9 is a perspective view Showing an external angle steel form and a fiat steel form as clamped together. The steel form for placing concrete shown in FIGURES l to}: is to be used for the flat surface concrete of a concrete structure. 7

A clamping arm is fitted rotatably around the axis of a connecting rod as a center together with the connecting rod or alone to the connecting rod which is passed through bores made in the external frame and center frame of the steel form and can move axially for a fixed length until it is regulated at two points of said bores so that, in assembling the form, when the other end of the connecting rod is inserted into the bore made in theexternal frame of the other form, each bore will be connected as supported at three points, the adjacent steel forms will be alined and the external frames jointed in such state may i be clamped with said clamping arms.

In FIGURES 1 and 2, longitudinal W-shaped external frames 2 each having a groove-shaped concave part 1 in the'center and provided with flanges 11 in the end parts and lateral external frames 3 are set on the periphery of a face plate 4 and a saddle-shaped center frame 5 is provided in the center on the face plate 4 to form a steel form for placing concrete. Bores 6 and 6' are made in the concave part 1 of the external frame 2 and in that side of the center frame 5 opposed to the external frame, respectively. A connecting rod 7 is axially movably supported between said bores 6 and 6. A U-shaped clamping arm 8 is provided on said connecting rod .7 nearthe external frame. Said clamping arm 8 is fixed or loosely fitted to the connecting rod 7. In case it is fixed, the clamping arm 8 will come into contact with the external frame 2 to prevent the connecting rod 7 from being pulled,

out. In case the clamping arm 8 is loosely fitted, stopper rings (not illustrated) will have to be provided on both' sides of the connecting rod 7 lest the rod should be pulled out of the bores 6 and 6'.

center frame 5 and, as illustrated in FIGURE 2, the clamping arm 8 will be housed and retained inside the external frame 2 so that the end of the connecting rod may be casethe above mentioned clamp is provided in the lateral. external frame 3 aninner end supporting metal fixture 9' of the same shape as of the center frame 5 may be provided and the connecting rod may be supportedin bores made in said supporting metal fixture 9 and external frame 3 as shown in FIGURE 6. Only when. the

bore made in the external frame of the other steel form to be clamped is concentric with the bore supporting the" connecting rod and the bore surfaces are parallel with each other, the bores will be able to be connected. Therefore, the above explained steel'forms for placing con crete can be always correctly alined. Further, as the clamp comprising the connecting rod and connecting arm is fitted to the steel form so that nothing may project when the form is not being used, the steel form is easy to carry When the steel form is not being used, the connecting rod 7 will retreat until one end of the rod is in contact with the other side 5" of'the' the external frames 2 and end plates 22;.

, 11 projecting horizontally on the upper lower sides are secured in four corners to form an outer frame Several reinforcing L-shaped frames 24 are provided between the end plates 22 and are secured at both ends to the external frames 2. The face plate 4 is bent on the longitudinal center line so as to be L-shaped and isfitted by being secured on the bent outside peripheral edges to A required number of bores 6 are made in the'concave part 1 of the external frame; A clamping arm 8 is provided on a connecting rod 7 to form a clamp. The connecting rod 7 is passed through a bore 14% in a supporting metal fixture 9 fixed at the lower end to the face plate 4 and a bore 6 in the external frame as in FIGURE 6 so that the clamp may be fitted to the steel form. In such case, the clamping arm 8 will come into contact with the external frame 2 or supporting metal fixture 9 so that the connecting rod 7 may be prevented from being pulled out of the bore 6 or ill, respectively. The steel forms A and B to bejOinted with the re-entering angle steel form are those illustrated in FIGURES 1 to 3.

Referring tofFIGURE 6 of the accompanying drawings, each clamping arm 8 is connected to its associated rod 7 by a supporting arm or member 8A which extends normally to the rod 7 and is located between the ends thereof in'a location substantially spaced from both ends. The U-shaped portion comprised by the relatively parallel opposed legs'fiB and 8C and the bridging portion 3E is supported from the supporting member 8A in a plane parallel to the rod 7 but spaced from the rod so that the clamping member'may move freely across the upper edges of the adjoining flanged portions 11 of the exterior frames. In the embodiment shown, the free end of the leg 83 is integrally connected with the outer end of support arm 8A. The arrangement is such that the open end of the U-shaped clamping members is directed generally tangentially to the path of rotation pursued by the other end of supporting arm 8A incident to its rotation about the axis of rod 7 Thus the open end'or mouth of the clamp is adapted to receive exterior frames of adjoining steel forms and to thus firmly interconnect'them in parallel relation when the clamping arm 8 is swung to its operative position such as is illustrated in FIG- URE 5. V

In assembling said steel form for a re-entering angle, first of all, as shown in FIGURES 4 to 7, the bores 6 made in the external frames 2 of the re-entering angle steel form and the steel form A or B are alined, each connecting rod 7 isadvanced'so that the forward part of the connect ingrod 7 may be passed through theib'ore in the othersteel form and the clamping arm 8 is then turned around the axis of the connecting rod so as to clamp the concave parts of the external frames. Thus the mutual positions will be fixed with the connecting rods '7 and the steel forms will be securely jointed by means of the clamping arms. Furtlier, as required, the steel forrns A'and B may be first jointed together, the alining pins maybe passed through any bores and then the steel fo'rms'may be jointed by means of the clamping arms. The re-entering angle steel form and the steel forms A and Bare clamped together by means of the connecting rods and clamping arms are illustrated in FIGURES. In case the re-ente'ring angle of the structure is not rectangular, if the internal angle of the endplate 22 is properly made equal to the re-entering angle, the present invention will be able to be worked. Further, even in case the re-entering angle part is arcuate, the invention will be able to be worlred. Also in the case of a steel form for external angle parts for placing concrete for a concrete structure, as illustrated in FIGURES 8 and 9, if the external angle part is rectangular, an outer frame may be formed of L-shaped end plates 22 and external frames 2 each having a groove-shaped concave part 1 in the central part and horizontally projecting fianges it on the upper and lower sides in the peripheral edge part inside a rectangularly bent face plate. The same as in the steel form for re-entering angle parts, a required number of bores 6 are made in the concave part 1 of the external frame, a clamping arm 8 is provided on a connecting rod '7 to form a clamp and the connecting rod 7 is passed through a bore ll) in a supporting metal fixture 9 fixed at the lower end to the face plate 4- and a bore 6 in the ex- 7 ternal frame so that the clamp may be fitted to the steel form. The external angle steel forms A and B as connected by means of the clamps are shown in FIGURE 9.

Though only the case in which the re-entering angle part is rectangular is mentioned in the embodiment, the re-entering angle part may be not only of an acute or obtuse angle but also arcuate in working the present invention.

What is claimed is:

1. An assembly of concrete placing steel forms, each said form comprising a face plate, external frame of a W-shape in cross section, each having a concave part and flanges, a center frame fixed on said face plate in spaced relation to said external frames, said center frame and external frames of each form being provided with relatively aligned bores therein, a rectilinear connecting rod slidably disposed through the bores in said center frame and external frame of one form for reception in an adjoining exterior frame of another form, a supporting arm projecting normally from each said rod at a location spaced from both of its ends and adapted for movement about the axis of the said rod, a U-shaped clamp carried by said arm in a plane spaced from and parallel to the rod, the open end of said U-shaped clamp being directed tangentially to the rotational path described by the free end of said supporting arm in its movement about the axis of said rod, the opening defined by said free ends being disposed wholly on one axial side of said supporting arm for reception of adjacent external frames.

2. The steel form for placing concrete according to claim 1 wherein fl'le clamping arm is mounted for rotation around the axis of the connecting rod as a center independently of the connecting rod.

3. The steel form for placing concrete according to 4. The steel form for placing concrete according to claim 1 wherein the clamping arm is loosely fitted to the connecting rod. I

5. The steel form for placing concrete according to claim 1 wherein the external frames of a W-shape each having a concave part and flanges are secured to the periphery of the face plate and supporting metal fixtures for the connecting rods are secured on the face plate.

6. The steel form for placing concrete according to claim 1 wherein the external frames of a W-shape each having a concave part and flanges are secured to the periphery of the face plate and a projecting center frame is secured between the opposed external frames.

7. A concrete placing steel form having clamps comprising end plates bent to any required angle or to be arcuate, a bent face plate of the same shape as of said endplate, external frames each having a concave part and flanges and secured to the peripheral part outside said face plate, a plurality of bores made in said external frames, reinforcing frames secured to said external frame and supporting metal fixtures secured on said face plate a connecting rod slidably supported in said bores and by said supporting metal fixtures and having a U-shaped clamping arm mounted for rotation around the axis of the connecting rod as a center and positioned between the ends of said rod so that when the steel form is assembled by inserting the outer ends of said connecting rod of one steel form into the bores made in the external frame of the other steel form, said rod will be connected to the steel forms and supported at three points, whereby the adjacent steel forms may be alined and the external frames jointed in such state may be clamped with said clamps.

8. A concrete placing steel form having clamps comprising a bent end plate, a bent face plate of the same shape as of said end plate, external frames each having a concave part and flanges and secured to the peripheral part inside said face plate, a plurality of bores made in said external frames, reinforcing frames secured to said external frame and supporting metal fixtures secured on said face plate and each supporting a connecting rod having a -U-shaped clamping arm on said rod between its ends provided rotatably around the axis of the connecting rod as a center so that when the steel form is assembled by inserting the outer ends of said connecting rods into the bores made in the external frame of the other steel form, each bore may be connected as supported at three points, the adjacent steel forms may be alined and the external frames jointed in such state may be clamped with said clamps.

9. The combination comprising a pair of adjoining steel forms and a combination clamp and aligning rod for connecting said forms, said forms including relatively parallel elongated external frames in contiguous relation along adjoining edges of said forms, center frames spaced from said external frames, said center frames and said external frames of the respective forms being provided with relatively aligned bores, said combination clamp and aligning rod comprising a rectilinear rod slidably disposed through the aligned bores of said contiguous external frames and the center frame of one of said forms and guided in said bores for axial sliding reception in and Withdrawal from said bores of one said external frame, a U-shaped clamp carried by said connecting rod, means supporting said clamp on the connecting rod in a plane parallel to said rod and spaced substantially therefrom, said means being spaced from both ends of the rod, said clamp defining an opening adapted for reception of the said contiguous external frames and disposed wholly on one axial side of said supporting means whereby rotary movement of said clamp about the axis of said rod may clamp it onto or disengage it from the said external frames.

References Cited by the Examiner UNITED STATES PATENTS 904,466 11/08 Wheary 292-5 1,458,399 6/23 Fairley -131 2,693,628 11/54 Hummel 25-131 FOREIGN PATENTS 771,558 4/57 Great Britain.

MICHAEL V. BRINDISI, Primary Examiner. 

1. AN ASSEMBLY OF CONCRETE PLACING STEEL FORMS, EACH SAID FORM COMPRISING A FACE PLATE, EXTERNAL FRAME OF A W-SHAPED IN CROSS SECTION EACH HAVING A CONCAVE PART AND FLANGES, A CENTER FRAME FIXED ON SAID FACE PLATE IN SPACED RELATION TO SAID EXTERNAL FRAMES, SAID CENTER FRAME AND EXTERNAL FRAMES OF EACH FORM BEING PROVIDED WITH RELATIVELY ALIGNED BORES THEREIN, A RECTILINEAR CONNECTING ROD SLIDABLY DISPOSED THROUGH THE BORES IN SAID CENTER FRAME AND EXTERNAL FRAME OF ONE FORM FOR RECEPTION IN AN ADJOINING EXTERIOR FRAME OF ANOTHER FORM, A SUPPORTING ARM PROJECTING NORMALLY FROM EACH SAID ROD AT A LOCATION SPACED FROM BOTH OF ITS ENDS AND ADAPTED FOR MOVEMENT ABOUT THE AXIS OF THE SAID ROD, A U-SHAPED CLAMP CARRIED BY SAID ARM IN A PLANE SPACED FROM AND PARALLEL TO THE ROD, THE OPEN END OF SAID U-SHAPED CLAMP BEING DIRECTED TANGENTIALLY TO THE ROTATIONAL PATH DESCRIBED BY THE FREE END OF SAID ROD, THE OPENING DEFINED BY SAID FREE ENDS AXIS OF SAID ROD, THE OPENING DEFINED BY SAID FREE ENDS BEIND DISPOSED WHOLLY ON ONE AXIAL SIDE OF SAID SUPPORTING ARM FOR RECEPTION OF ADJACENT EXTERNAL FRAMES. 